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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Neuroscience. 2011 Oct 14;206:167–182. doi: 10.1016/j.neuroscience.2011.09.060

Figure 1. Experimental Protocol.

Figure 1

On each trial, a fixation was displayed for 200ms and then turned off. Following a delay period (randomly jittered between 1–1.2 seconds) a stimulus (digit 0–9) was delivered for one of the 3 experimental durations (½ threshold; threshold and 100ms). A response tone was played 500ms after the stimulus was turned off cuing subjects to report the number they saw using a button press. If subjects were unable to recognize the displayed token, they were instructed to press a random button and continue to the next trial.